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US 4,070,615 AGranted
Compensation indicator for attenuation probe
AssigneeTektronix, Inc.
InventorRoland Emil Crop
Life of this patent
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Abstract
A circuit is provided for generating signals proportional to distortion of a square-wave reference signal caused by the impedance mismatch of an attenuator probe and the input impedance of an electronic instrument. The generated signals are utilized to control an indicator device and thereby provide an indication of the mismatch as well as proper compensation of the probe.
Claims7
A circuit for indicating adjustment of a frequency compensation network;
- comprising;
- a source of square-wave signals, said frequency compensation network being coupled to the output of said signal source;
- differential amplifier means having a first input coupled to the output of said frequency compensation network and a second input coupled to the output of said signal source;
- the output signal of said differential amplifier being proportional to distortion caused by said frequency compensation network;
- means for converting said output signal to a control voltage;
- and
- indication means responsive to said control voltage for providing an indication of said compensation network adjustment.
4 more elements
A circuit for indicating the adjustment of a frequency-compensated attenuator probe coupled to the input circuit of an electronic instrument, comprising:
- a square-wave generator;
- a differential amplifier for producing a difference signal;
- a first signal path from said square-wave generator through said probe and input circuit to a first input of said differential amplifier;
- a second signal path from said square-wave generator to a second input of said differential amplifier;
- and
- an output circuit including an indicating device connected to said differential amplifier, said output circuit developing a control voltage porportional to said difference signal to be applied to said indicating device.
3 more elements
Dependencies are inferred from the claim text.